In preparation for becoming an internal plugin in chrome I did these things:...

plugin/mac/graphics_utils_mac.h

Index: plugin/mac/graphics_utils_mac.h
===================================================================
--- plugin/mac/graphics_utils_mac.h	(revision 20106)
+++ plugin/mac/graphics_utils_mac.h	(working copy)
@@ -36,6 +36,8 @@
 #include <Cocoa/Cocoa.h>
 #include <AGL/agl.h>
 
+namespace o3d {
+
 void SlideWindowToRect(WindowRef the_window,
                        CGRect destination_rect,
                        double transition_duration_seconds);
@@ -53,4 +55,6 @@
 void PaintRoundedCGRect(CGContextRef context, CGRect rect,
                         float radius, bool fill);
 
+}  // namespace o3d
+
 #endif  //  O3D_PLUGIN_MAC_GRAPHICS_UTILS_MAC_H_